I’ll admit, it’s a gray answer: it depends.
Progression of a plank should be made with caution and only after you can successfully perform specific transverse abdominis activation and rectus abdominis without exacerbating the diastasis (these are done in our Diastasis Recti program).
SECOND, you should be able to say yes to all of the following:
-I’ve followed the Core Foundation and feel confident in activating my transverse abdominis (TA).
-My navel pulls up and easily when I plank for 3-5 seconds.
-I can perform a TA breath while holding a modified plank.
-There is no pain in my lower back when I do a modified plank.
-I have have recently reduced my separation, to 2 finger widths or less, through core training [if you have a moderate to severe case, 1-1 attention with a physical therapist or physiotherapist is best]!
As your diastasis gets smaller you can start incorporating longer (>10 seconds), more traditional bouts of core exercise. This is done for you inside the 3 phases of our Diastasis Recti program. Our workouts are corrective + traditional. So I am always giving you cues to activate the TA or pull in your belly tissues or brace before twisting.
When you are ready (you’ve said YES to the bullet points listed above) start in a quadruped position as shown in the video below. Slowly work up to a modified plank. The focus of treating diastasis recti should always involve re-education of the core muscles to allow for optimal function and load transfer in functional positions and activities.
There are specific activities you should avoid. In general, loading of the rectus abdominis, twisting of the trunk, traditional core exercises (sit ups, crunches, planks…) and heavy lifting are contraindicated (not recommended). That said this condition is unique to each individual.
If you’ve had prior transverse abdominis training or diastasis recti rehab, you know how to cue the TA during exercise. Therefore you should be able to progress a little quicker. Again this is unique to each individual. And those with a moderate to severe case should be working with a physiotherapist or physical therapist.
Keep in mind, it’s not just the half hour of exercise…is the other 23.5 hours a day that count (posture, picking up kids, twisting, etc.) Cue your TA to activate in these positions as well!
In the past, plank exercises have been considered contraindicated in individuals with DR. However, a recent study by Walton 2016, found that a specific abdominal stabilization exercise program that included a traditional prone on elbows plank with the use of abdominal bracing was effective in reducing DR in individuals who were 3-36 months’ post-partum with presence of DR.
It should be noted, the control group that included an abdominal crunch with bracing and had a more significant improvement in inter-recti distance than the experimental group that included a plank. It was concluded that although the control group demonstrated a greater reduction in inter-recti distance, the women in the experimental group did not have adverse results with incorporating a traditional plank exercise. The inclusion of a plank exercise should be closely monitored to ensure proper transverse abdominis activation and limit strain through the linea alba and rectus abdominis.
For more information on adding traditional core exercises, download our Ab Rehab Guide.